1.2KV /1600‑3150A ANSI Bushing Shovel‑face Opening for High‑Current Transformer Terminals

Introduction

Structural Features of 1.2KV /1600‑3150A ANSI Bushing

All models within this series share identical overall installation dimensions; differences are mainly reflected in bottom thread Md specifications to fit different current grades. According to general industry practice, non‑standard modified dimensions can be custom‑manufactured to satisfy special transformer design and retrofit project requirements.

Product Model Overview

1. ANSI‑1.2/1600: Rated current 1600A, Md thread M38*2.0. Suitable for medium‑heavy current circuits of ANSI‑standard distribution transformers.
2. ANSI‑1.2/2000: Rated current 2000A, Md thread M42*2.0. Upgraded conductive section for higher continuous load current.
3. ANSI‑1.2/2500: Rated current 2500A, Md thread M45*2.0. Optimized conductive structure for heavy‑current working conditions.
4. ANSI‑1.2/3150: Rated current 3150A, Md thread M48*2.0. Maximum current rating in this series, applied for main circuit and high‑output transformer low‑voltage terminals.

All four models adopt the same face‑mill opening structure, consistent tank opening size d0, identical arcing distance and creepage distance. The main distinction lies in the bottom fastening thread size to match rising current grades.

Core Advantages of 1.2KV /1600‑3150A ANSI Bushing

• ANSI Standard Compliance: Designed and dimensioned to align with North‑American ANSI transformer requirements, perfectly matching ANSI‑spec oil‑immersed transformers for export to North‑American and other markets adopting American power standards.
• Heavy‑Current Capacity: Covers 1600A‑3150A continuous current range, meets low‑voltage high‑current terminal demands for large‑capacity distribution transformers.
• Face‑Mill (Scoop‑Face) Opening Mounting Structure: Specialized tank opening design paired with supporting 4‑Φ14 aluminum clamp, realizes stable mechanical fixation and excellent oil‑proof sealing performance, effectively preventing transformer oil leakage.
• Unified Mounting Footprint: All current‑grade models keep the same overall height, tank opening dimension and terminal plate outline. Designers and manufacturers do not need to modify tank cut‑out when switching among different current ratings, simplifying transformer mechanical design and part stock management.
• Robust High‑Current Terminal Design: Multi‑hole flat terminal plate provides reliable contact interface for large‑size busbar connection, lowering contact resistance and reducing overheating risk under long‑term heavy‑load operation.
• Multiple Thread Options: Different Md thread specifications correspond to each current grade, ensuring sufficient mechanical strength and conductive cross‑section for each ampere rating.

• Customization Support: Non‑standard dimensional modifications are available for special new‑build transformer projects or equipment retrofits.

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Typical Application Scenarios

Technical Specifications Table

Table: 1.2KV /1600‑3150A ANSI Bushing Technical & External Dimensions

Notes:

1. The above data are standard reference dimensions for general industry usage.
2. Special non‑standard sizes can be customized according to project requirements.
3. Matching aluminum clamp with 4‑Φ14 holes is used for tank mounting; tank opening layout is Φ150.

Selection Guide for 1.2KV /1600‑3150A ANSI Bushing

1. Confirm Rated Current: Select proper model according to transformer low‑voltage rated output current: 1600A, 2000A, 2500A or 3150A. All models carry 1.2 kV rated voltage.
2. Check Mounting Compatibility: Verify tank opening dimension d0, Φ150 hole layout and aluminum clamp 4‑Φ14 fastening holes. Since all current grades share identical mounting footprint, tank design does not require changes when upgrading current capacity.
3. Verify Thread Specification: Confirm Md thread matches design drawing; different current grades correspond to different thread sizes.
4. Terminal Matching: Check flat terminal plate dimension BB1 and n1Φd2 bolt holes to ensure compatibility with on‑site bus‑bar connection hardware.
5. Custom Requirement Confirmation: For special transformer structures or retrofit projects, confirm whether non‑standard dimension modification is needed.
6. Standard Compliance: For North‑American export projects, verify full compliance with applicable ANSI bushing related standards.

Pre‑installation Inspection

• Inspect the insulating surface for cracks, chips or mechanical damage. Damaged units must not be installed.
• Compare all key dimensions against project drawings: overall height, tank opening size, Md thread, terminal plate size and bolt hole positions.
• Check sealing components for integrity. Review factory test reports covering insulation resistance and contact resistance test records.

Installation Recommendations

• Apply the supporting 4‑Φ14 aluminum clamp for tank mounting. Tighten clamp bolts evenly with proper torque value. Over‑torque may crack insulation parts; insufficient torque will lead to oil leakage.
• Avoid heavy impact to the insulator during handling and assembly.
• Fasten top bus‑bar connection bolts with correct torque. Poor contact will generate excessive heat under high‑current load.
• Ensure proper sealing gasket placement between bushing and transformer tank surface to maintain oil‑tight performance.

Periodic Maintenance Tips

Conclusion